TLDR: Only one version is working with SSL, either www or non-www, as same as hostname provided while installation. It’s related to Let’s Encrypt SSL installation as written at Docs . So, after launching setup it was asked to enter Hostname for your Discourse? [discourse.example.com]: So, I type…

Problem in installing Let's Encrypt SSL for www and non-www

Sujet		Réponses	Vues
LetsEncrypt working without www, not with www Support	12	1797	Février 18, 2020
SSL working on root, but not on www Support	29	4213	Décembre 30, 2021
Non www to www without certificate error Installation	14	1784	Février 16, 2022
Making 'www' work with Discourse Support	30	2196	Mai 15, 2020
Force non-www to www redirect Support	5	1034	Janvier 27, 2023